AS21880 216.198.56.0/21 CIDR and IP Range Summary.ASN: 21880 - Zendesk Inc.Host Count: 2046Addressable IPs: 2048216.198.56.0/24216.198.57.0/24216.198.58.0/24216.198.59.0/24216.198.60.0/24216.198.61.0/24216.198.62.0/24216.198.63.0/24